What is the rarest blood type in humans?

The rarest blood type in humans is AB negative (AB-). Only about 1% of the world's population has this blood type.

AB- is considered a rare blood type because it is the result of inheriting two recessive alleles, one from each parent, which makes it less common than other blood types. It is also considered the universal plasma donor, meaning that anyone can receive AB- plasma, regardless of their own blood type.

People with AB- blood type are also known to be more susceptible to certain health conditions, such as heart disease, stroke, and blood clots.